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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8b31dfd0c2081418e7eadf5b2dfe41c1a5fadac3be458a6bf195a6ca234f0b6' 
  AND token = 'xh5yhzmCLmEqaxldumfCk39doed4DO3GCAJBEnqovNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}